Deffinately not a Chub.
I believe its a Male blunt nose minnow. Black spot on the caudal fin near the base, Breeding male is black with silver bar behind opercle which this one also has.
A male fatheads head is usually very large and they have white/ gold patches on their body, this fish has neither. A bullhead minnow's eye is usually a bit more upward, but this fish's eyes are more central